{"id":32882,"date":"2023-02-02T20:13:37","date_gmt":"2023-02-02T14:43:37","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-error-in-classes-c\/"},"modified":"2023-02-02T20:13:37","modified_gmt":"2023-02-02T14:43:37","slug":"solved-error-in-classes-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-error-in-classes-c\/","title":{"rendered":"[Solved] Error In classes C++"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-28774289\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"28774289\" data-parentid=\"28772137\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>If you do not provide any constructor in your class, the compiler will automatically create one for you.<br \/>\nIn your class, you have specified a particular constructor:<\/p>\n<pre><code>MonthData(double, int, double, double, int, double, double);\n<\/code><\/pre>\n<p>As soon as you provide any constructor, the compiler will not create a default constructor (i.e. one that takes no parameters).<\/p>\n<p>You are calling<\/p>\n<pre><code>MonthData data();\n<\/code><\/pre>\n<p>You are passing no parameters here but you have no constructor that takes no parameters.<br \/>\nYou probably meant to call<\/p>\n<pre><code>MonthData data(with 7 parameters);\n<\/code><\/pre>\n<p>Alternatively, add the following to your MonthData class body:<\/p>\n<pre><code>MonthData();\n<\/code><\/pre>\n<p>Then in your data.cpp, need to provide the code for what this constructor should do, i.e.<\/p>\n<pre><code>MonthData::MonthData()\n{\n   \/\/Initialise as required - but better to use a member initialization list\n}\n<\/code><\/pre>\n<p>It would be better to use a member initialization list for your 7 member variables.<br \/>\nFor example:<\/p>\n<pre><code>MonthData::MonthData()\n : year(2014), month(2), temp_maximum(15.4), temp_minimum(2.1), air_frost(5), rain(5.6), sun(7.6)    \/\/Use desired default values\n{}\n<\/code><\/pre>\n<p>This simple constructor code could instead be put directly in the class body in the header file:<\/p>\n<pre><code>class MonthData\n{\n  public:\n    \/\/overload constructor\n    MonthData(double y, int m, double max, double min, int fr, double r, double s)\n: year(y), month(m), temp_maximum(max), temp_minimum(min), air_frost(fr), rain(r), sun(s) {};\n\n    \/\/default constructor\n    MonthData()\n: year(2014), month(2), temp_maximum(15.4), temp_minimum(2.1), air_frost(5), rain(5.6), sun(7.6) {};\n\n    etc\n};\n<\/code><\/pre>\n<p>In addition &#8211; review your variable types. Should year really be a double? Also you have month declared as a double but your accessor returns an int.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Error In classes C++ <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] If you do not provide any constructor in your class, the compiler will automatically create one for you. In your class, you have specified a particular constructor: MonthData(double, int, double, double, int, double, double); As soon as you provide any constructor, the compiler will not create a default constructor (i.e. one that takes no &#8230; <a title=\"[Solved] Error In classes C++\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-error-in-classes-c\/\" aria-label=\"More on [Solved] Error In classes C++\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,519],"class_list":["post-32882","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-class"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Error In classes C++ - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-error-in-classes-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Error In classes C++ - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] If you do not provide any constructor in your class, the compiler will automatically create one for you. In your class, you have specified a particular constructor: MonthData(double, int, double, double, int, double, double); As soon as you provide any constructor, the compiler will not create a default constructor (i.e. one that takes no ... 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